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very low shutter speed | by Rodrigo Soldon 2
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very low shutter speed

In photography, exposure is the total amount of light allowed to fall on the photographic medium (photographic film or image sensor) during the process of taking a photograph. Exposure is measured in lux seconds, and can be computed from exposure value (EV) and scene luminance over a specified area.

 

In photographic jargon, an exposure generally refers to a single shutter cycle. For example: a long exposure refers to a single, protracted shutter cycle to capture enough low-intensity light, whereas a multiple exposure involves a series of relatively brief shutter cycles; effectively layering a series of photographs in one image. For the same film speed, the accumulated photometric exposure (H) should be similar in both cases.

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En fotografía, se llama exposición a la cantidad de luz que recibe el material fotosensible (en fotografía química) o el sensor de imagen (en fotografía digital) para que se forme una imagen.

 

Matemáticamente: exposición = iluminancia x tiempo.

 

Como indica la fórmula anterior, la exposición, que se mide en lux segundo,1 es una combinación del tiempo y del nivel de iluminación recibido por el material fotosensible.

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Taken on June 7, 2011